国产欧美丝袜小视频,国产特级毛片AAAAAA,国产精品兄妹在线观看麻豆,中文日韩亚洲欧美字幕,国产一级a毛一级a看免费视频_国产精品高潮呻吟久久av无码_亚洲色偷偷综合亚洲AV伊人蜜桃_欧美日韩国产一级成人黄片专区久久不卡免费看_欧美成人精品欧美一级乱黄_99在线精品国自产拍中文字幕 ,国产综合成人久久大片_久久久久久夜精品精品免费_蜜臀爱AV中文无码_国产色青青视频在线观看撒_99热精品国产三级在线观看_a级毛片免费网站 ,一级特黄AAA大片在线观看_国产一级a毛一级a看免费视频_一级a性色生活片久久无少妇一级婬片免费放_国产女人18毛片水真多18精品_免费看一级高潮毛片_天天综合网～永久入口_91丨蜜桃丨精品入口

The white dynamic core shooter uses coated sand to make cores and is suitable for hot core boxes.The feature of the core shooter is that four guide pillars are used to install the upper and lower mold bases. The upper and lower molds are respectively installed on the upper and lower mold bases. The positioning is precise , then opening and closing molds are divided horizontally, and the material is convenient to take out . It is also equipped with core pulling , which is suitable for the production of complex products. The core shooter is widely used in the foundry industry. The cores made by the core shooter are accurate in size and smooth in surface. The woriing priciple of the core shooter is to inject the core sand mixture with solid thermosetting resin as the binder into the heated core box,and the sand core is preheated in the core box and quickly hardens to a certain thickness .It is taken out to form a finished hig-quality sand core with a smooth surface and precise dimensions.